Encyclopedias, Almanacs, Transcripts, and Maps
- Umayya Ibn Abī Al-Salt
- Umm Kulthum (1904?–1975)
- Una Sancta
- Unam Sanctam
- Unamuno y Jugo, Miguel de
- Unclassified Christian Churches
- Unclassified Christian Churches
- Unclassified Christian Churches
- Unclassified Religious Groups
- Unclassified Religious Groups
- Unclassified Religious Groups
- Unda
- Underhill, Evelyn
- Understanding (Intellectus)
- Understanding, Gift of
- Undset, Sigrid
- Ungar, Benjamin
- Ungar, Joel of Rechnitz
- Unger, Irwin
- Unger, Josef